Doubling Against the T E N
Firstly:
Considering only the options of Double or Hit for the counts of Zero thru +4 : Had you considered the option of splitting with a very negative count you definitely shouldn't if have a count of -10 get up and leave.
| True Count |
|---|
| Your Hand | Act | 0 | +1 | +2 | +3 | +4 |
|---|
| 9 | Dou | .1780 | .1944 | .2099 | .2267 | .2448 |
|---|
| Hit | .3780 | .3931 | .4088 | .4251 | .4422 |
| 10 | Dou | .3560 | .3888 | .4198 | .4534 | .4896 |
|---|
| Hit | .3780 | .3931 | .4088 | .4251 | .4422 |
Next:
It's pointless to consider the probabilities when the count is less than 0, because the doubling of the bet is not eclipsed by the doubling of the excepted return until +2, true count, using any number of the plus minus system: Dubin, Einstein, Thorpe etc.
Finally:
If the notion of splitting 5-5 crossed your mind, Well you' be turning a good hand into two really bad hands, not good,